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doepfer

System A - 100

External Foot Controller

A-177

1. Introduction

Module A-177 (External Foot Controller) gives you

the option of integrating

two

foot pedals

and

one

double foot switch into the System A-100.

That gives you the ability to use

pedals

to send

control voltages, and foot-switches to send gate

signals, in real time - very useful in the creative

sound-making process.

The foot pedal inputs have scale control knobs, for

manual adjustment of the voltage scale they put out.

Trim pots are available to provide an offset

for the

particular foot pedals you use (if for instance they don’t

otherwise go exactly to zero at the minimum point of

their travel).

A-177

Ext. Foot Controller

Scale

Foot

Ctr. 1

CV 1

Scale

Foot

Ctr. 2

CV 2

Double

Foot

Switch

Gate 1

Gate 2

Summary of content (6 pages)

PAGE 1
System A - 100 doepfer External Foot Controller A-177 1. Introduction A-177 Ext. Foot Controller Scale CV 1 Foot Ctr. 1 Scale CV 2 Foot Ctr. 2 Gate 1 Module A-177 (External Foot Controller) gives you the option of integrating two foot pedals and one double foot switch into the System A-100. That gives you the ability to use pedals to send control voltages, and foot-switches to send gate signals, in real time - very useful in the creative sound-making process.
PAGE 2
A-177 External Foot Controller System A - 100 Controls: 2. Overview A-177 EFC EXT. FOOT CONTROLLER ➂ CV 1 ➀ CV 2 ➁ 10 Foot Ctr. 1 Gate 1 Gate 2 2 2 Scale : voltage range control for pedal 2 3, 4 LEDs : LED indicators to show the voltage being sent by pedals 1 and 2 5, 6 LEDs : LED indicators to show the gate signal being sent by switches 1 and 2 In / Outputs: Scale 0 ➅ voltage range control for pedal 1 10 Foot Ctr.
PAGE 3
System A - 100 doepfer External Foot Controller A-177 3. Controls 1 Scale • 2 Scale Controls 1 and 2 are used to set the overall range of the control voltages ( CV 1 or CV 2) put out by footpedals 1 or 2. H 3 LED Doepfer’s own design of footpedal is ideally suited to the System A-100, but other makes can be used. If you do use other designs, it may happen that the control voltage won’t go all the way down to zero.
PAGE 4
A-177 External Foot Controller System A - 100 potentiometer slider doepfer ( Double Foot Switch Socket ( is the input for a double footswitch. It is designed to take a stereo 6.5mm jack plug. The connection diagram is shown in fig. 2. potentiometer maximum position potentiometer minimum position fig. 1: foot pedal connection diagram GND switch 1 switch 2 $ CV 2 CV output $ is the socket for the control voltage CV 2 put out by foot pedal 2. LED 4 shows the level of the voltage.
PAGE 5
doepfer System A - 100 5. User examples Typical foot pedal uses External Foot Controller A-177 different voltage levels (see fig. 3) or signal sources by means of voltage-controlled switches (the A-150 and/ or A-151). You can connect a foot pedal or two up to the A-177 whenever you want to use a real-time variable control voltage in your creation of sounds. A-177 Classic uses are, for instance, to control loudness with a VCA, or timbre with a VCF, or to vary the intensity of a modulation, etc..
PAGE 6
A-177 External Foot Controller System A - 100 doepfer 6. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper. Photocopy this page, and cut out the pictures of this and your other modules. You can then stick them onto another piece of paper, and create a diagram of your own system. A-177 EFC EXT.